package com.lv.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.lv.common.CustomException;
import com.lv.mapper.CategoryMapper;
import com.lv.pojo.Category;
import com.lv.pojo.Dish;
import com.lv.pojo.Setmeal;
import com.lv.service.CategoryService;
import com.lv.service.DishService;
import com.lv.service.SetmealService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

/**
 * @Author:晓风残月Lx
 * @Date: 2022/5/3 9:25
 */
@Service
@Slf4j
public class CategoryServiceImpl extends ServiceImpl<CategoryMapper, Category> implements CategoryService {

    @Autowired
    private DishService dishService;

    @Autowired
    private SetmealService setmealService;

    /**
     * 根据id删除分类，删除之前需要进行判断
     * @param id
     */
    @Override
    public void remove(Long id) {
        // 查询当前分类是否关联了菜品，如果已经关联，抛出一个业务异常
        LambdaQueryWrapper<Dish> dishLambdaQueryWrapper=new LambdaQueryWrapper<>();
        // 添加查询条件，根据分类id进行查询
        dishLambdaQueryWrapper.eq(Dish::getCategoryId,id);
        int dishCount = dishService.count(dishLambdaQueryWrapper);
        if(dishCount>0){
            // 已经关联菜品，抛出异常
            throw new CustomException("当前分类下关联菜品，不能删除");
        }

        // 查询当前分类是否关联了套餐，如果已经关联，抛出一个业务异常
        LambdaQueryWrapper<Setmeal> setmealLambdaQueryWrapper=new LambdaQueryWrapper<>();
        // 添加查询条件，根据分类id进行查询
        setmealLambdaQueryWrapper.eq(Setmeal::getCategoryId,id);
        int setmealCount = setmealService.count(setmealLambdaQueryWrapper);
        if(setmealCount>0){
            // 已经关联套餐，抛出异常
            throw new CustomException("当前分类下关联套餐，不能删除");
        }

        // 正常删除分类
        super.removeById(id);
    }
}
